Abstract

A Coulomb torsion balance apparatus was developed with which absolute measurements of para- and diamagnetic susceptibilities could be made in non-fluctuating field strengths of the order of 1 oersted. Solid specimens of the diamagnetic elements, bismuth, antimony, and cadmium, were measured in fields of 2.5, 5, and 10 oersteds, and the paramagnetic powders, FeCl 3 , FeSO 4 +7H 2 O, and Co 2 (SO 4 ) 3 +7H 2 O, in fields of 2, 3, and 5 oersteds. The susceptibilities decreased with increasing field strengths. A specimen of bismuth granules had lower susceptibilities than did the solid specimen made from the same supply of granules. A semi-micro balance apparatus also was constructed for absolute measurements in fields ranging between 100 and 1,000 oersteds. The susceptibilities of the diamagnetic specimens and a water specimen were measured. The solid bismuth, antimony, and cadmium specimens and a water specimen exhibited constant susceptibilities. The susceptibility of the bismuth-granule specimen increased regularly from -4.67 to -7.87X10 (super -6) C.G.S. when the field increased from 100 to 900 oersteds. The value found for water (-0.73X10 (super -6) ) agreed well with the International Critical Tables value (-0.72X10 (super -6) C.G.S.).

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